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Mirrors > Home > ILE Home > Th. List > ssexd | GIF version |
Description: A subclass of a set is a set. Deduction form of ssexg 4062. (Contributed by David Moews, 1-May-2017.) |
Ref | Expression |
---|---|
ssexd.1 | ⊢ (𝜑 → 𝐵 ∈ 𝐶) |
ssexd.2 | ⊢ (𝜑 → 𝐴 ⊆ 𝐵) |
Ref | Expression |
---|---|
ssexd | ⊢ (𝜑 → 𝐴 ∈ V) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ssexd.2 | . 2 ⊢ (𝜑 → 𝐴 ⊆ 𝐵) | |
2 | ssexd.1 | . 2 ⊢ (𝜑 → 𝐵 ∈ 𝐶) | |
3 | ssexg 4062 | . 2 ⊢ ((𝐴 ⊆ 𝐵 ∧ 𝐵 ∈ 𝐶) → 𝐴 ∈ V) | |
4 | 1, 2, 3 | syl2anc 408 | 1 ⊢ (𝜑 → 𝐴 ∈ V) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∈ wcel 1480 Vcvv 2681 ⊆ wss 3066 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-io 698 ax-5 1423 ax-7 1424 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-10 1483 ax-11 1484 ax-i12 1485 ax-bndl 1486 ax-4 1487 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2119 ax-sep 4041 |
This theorem depends on definitions: df-bi 116 df-tru 1334 df-nf 1437 df-sb 1736 df-clab 2124 df-cleq 2130 df-clel 2133 df-nfc 2268 df-v 2683 df-in 3072 df-ss 3079 |
This theorem is referenced by: fex2 5286 riotaexg 5727 opabbrex 5808 f1imaen2g 6680 fiss 6858 genipv 7310 suplocexprlemlub 7525 hashfacen 10572 ovshftex 10584 strslssd 11994 restid2 12118 2basgeng 12240 cnrest2 12394 cnptopresti 12396 cnptoprest 12397 cnptoprest2 12398 cnmpt2res 12455 psmetres2 12491 xmetres2 12537 limccnp2lem 12803 limccnp2cntop 12804 dvfvalap 12808 dvmulxxbr 12824 dvaddxx 12825 dvmulxx 12826 dviaddf 12827 dvimulf 12828 dvcoapbr 12829 dvmptaddx 12839 dvmptmulx 12840 |
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